From mass graves to mass kidnappings, the situation in parts of Mexico continues to look grim. Mexico's federal police rescued 51 people, including six Chinese and 18 Central American migrants, who were captive in the same border city where more than five dozen people were freed last week, authorities said Monday night. Police investigators were led to the latest group while following up on last week's rescue of 68 people in Reynosa, across from McAllen, Texas, federal officials said. Authorities gave no motives or identified the kidnappers or drug gang involved, but drug cartels have been accused of pulling people...